https://devzone.nordicsemi.com/f/nordic-q-a/6304/lfclk-accuracy-in-smart-beacon-kitDear all, I have a question on the LFCLK accuracy in the smart beacon kit, which is pca20006. When I see the specification of LFCLK crystal 32.768kHz, this crystal has +-20ppm. From smart beacon reference source v1.0.1, the ble_stack_init functionen-USTelligent Community 13Tue, 31 Mar 2015 13:53:26 GMThttps://devzone.nordicsemi.com/thread/21998?ContentTypeID=1Tue, 31 Mar 2015 13:53:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:65f35e5b-6bba-4797-bc2b-35209bc2f5f6Asbj&#248;rn<p>The change is done in order to have slightly better tolerances towards central devices that behaves outside or at the edge of the timing specification defined by Bluetooth SIG. If you configure to have a slightly worse crystal than you have the softdevice will compensate for the worse tolerance by extending the listening window slightly. So you&#39;ll pay in the sense of slightly more current consumption. It&#39;s less important if the beacon is only used a beacon, if it&#39;s used during connection to configure the beacon or do a DFU, this could come in to play.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/21997?ContentTypeID=1Tue, 31 Mar 2015 00:52:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8300c986-7df4-43a3-bb64-0ac794d5b8d3Locky<p>Likely for greater timing error margin with Smart phones. Alot of todays smartphones don&#39;t have the most accurate LFCLKs. Pretty sure the iPhone 6 doesn&#39;t even properly follow the SIG&#39;s BLE timing</p><div style="clear:both;"></div>